Promote the co-op with your own site like this.

For anyone you refer to the co-op, you receive a weight bonus of 10% (of the person referred). For example....

To get your code, log in to the co-op and click 'How to receive weight bonuses' You'll get a URL like

http://www.digitalpoint.com/tools/ad-network/?s=25555

Enter the number in this form to get your HTML code.

The web page will look just like this one with your refer link in the links through out the content.

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